According to WebBikeWorld.com,
"Scooter sales are way up at +65.7% over last year's January to June sales, with 49,231 scooters sold during the first two quarters of 2008. Scooter sales were up +89.4% in the month of June alone compared to June of 2007, so the trend remains on an upward swing." Source: Motorcycle Industry Council
Don't know how many are TGBs, but still a good sign.